From 63fa47ba886b86cbd58f03b3b01b04bd57a1f233 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Mon, 13 Dec 2021 17:45:56 +0000 Subject: [PATCH] KVM: PPC: Book3S HV P9: Use kvm_arch_vcpu_get_wait() to get rcuwait object Use kvm_arch_vcpu_get_wait() to get a vCPU's rcuwait object instead of using vcpu->wait directly in kvmhv_run_single_vcpu(). Functionally, this is a nop as vcpu->arch.waitp is guaranteed to point at vcpu->wait. But that is not obvious at first glance, and a future change coming in via the KVM tree, commit 510958e99721 ("KVM: Force PPC to define its own rcuwait object"), will hide vcpu->wait from architectures that define __KVM_HAVE_ARCH_WQP to prevent generic KVM from attepting to wake a vCPU with the wrong rcuwait object. Reported-by: Sachin Sant Signed-off-by: Sean Christopherson Tested-by: Sachin Sant Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211213174556.3871157-1-seanjc@google.com --- arch/powerpc/kvm/book3s_hv.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 7986911b873c..f64e45d6c0f4 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4442,6 +4442,7 @@ static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu) int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpcr) { + struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu); struct kvm_run *run = vcpu->run; int trap, r, pcpu; int srcu_idx; @@ -4588,7 +4589,7 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, if (is_kvmppc_resume_guest(r) && !kvmppc_vcpu_check_block(vcpu)) { kvmppc_set_timer(vcpu); - prepare_to_rcuwait(&vcpu->wait); + prepare_to_rcuwait(wait); for (;;) { set_current_state(TASK_INTERRUPTIBLE); if (signal_pending(current)) { @@ -4605,7 +4606,7 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, schedule(); trace_kvmppc_vcore_blocked(vc, 1); } - finish_rcuwait(&vcpu->wait); + finish_rcuwait(wait); } vcpu->arch.ceded = 0; -- 2.11.0